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Kondo effect in quantum dots: A non-...

Goker, Ali Ihsan.

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Kondo effect in quantum dots: A non-crossing approximation study.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Kondo effect in quantum dots: A non-crossing approximation study./
Author:	Goker, Ali Ihsan.
Description:	89 p.
Notes:	Adviser: Peter Nordlander.
Contained By:	Dissertation Abstracts International69-04B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3309878
ISBN:	9780549579441

Kondo effect in quantum dots: A non-crossing approximation study.
Goker, Ali Ihsan.

Kondo effect in quantum dots: A non-crossing approximation study. - 89 p.

Adviser: Peter Nordlander.

Thesis (Ph.D.)--Rice University, 2008.

In this thesis, non-equilibrium Green's function techniques in combination with the time-dependent non-crossing aprroximation are utilized to calculate the transient currents through a quantum dot in the Kondo regime subject to sudden perturbations. We first present novel numerical algorithms which enable relatively fast calculations. We then employ these algorithms to study the transient current through a quantum dot which is symmetrically coupled to metallic leads and its coupling to the leads is abruptly switched such that the Kondo effect is present in the final state. The timescales for the approach to equilibrium are shown to be the same as the ones when the energy level of the dot is suddenly switched. Finally, we study the transient currents in a quantum dot asymmetrically coupled to metallic leads resulting from the abrupt change of the dot level. We show that for asymmetric coupling, sharp features in the density of states of the leads can induce oscillations in the current through the dot. The amplitude of these oscillations increases as the temperature is reduced and saturates below the Kondo temperature. We discuss the microscopic origin of these oscillations and comment on the possibility for their experimental detection.

ISBN: 9780549579441Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Kondo effect in quantum dots: A non-crossing approximation study.
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008 110624s2008 ||||||||||||||||| ||eng d
020 $a 9780549579441
035 $a (UMI)AAI3309878
035 $a AAI3309878
040 $a UMI $c UMI
100 1 $a Goker, Ali Ihsan. $3 1279850
245 1 0 $a Kondo effect in quantum dots: A non-crossing approximation study.
300 $a 89 p.
500 $a Adviser: Peter Nordlander.
500 $a Source: Dissertation Abstracts International, Volume: 69-04, Section: B, page: 2376.
502 $a Thesis (Ph.D.)--Rice University, 2008.
520 $a In this thesis, non-equilibrium Green's function techniques in combination with the time-dependent non-crossing aprroximation are utilized to calculate the transient currents through a quantum dot in the Kondo regime subject to sudden perturbations. We first present novel numerical algorithms which enable relatively fast calculations. We then employ these algorithms to study the transient current through a quantum dot which is symmetrically coupled to metallic leads and its coupling to the leads is abruptly switched such that the Kondo effect is present in the final state. The timescales for the approach to equilibrium are shown to be the same as the ones when the energy level of the dot is suddenly switched. Finally, we study the transient currents in a quantum dot asymmetrically coupled to metallic leads resulting from the abrupt change of the dot level. We show that for asymmetric coupling, sharp features in the density of states of the leads can induce oscillations in the current through the dot. The amplitude of these oscillations increases as the temperature is reduced and saturates below the Kondo temperature. We discuss the microscopic origin of these oscillations and comment on the possibility for their experimental detection.
590 $a School code: 0187.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Theory. $3 1019422
690 $a 0611
690 $a 0753
710 2 $a Rice University. $3 960124
773 0 $t Dissertation Abstracts International $g 69-04B.
790 $a 0187
790 1 0 $a Nordlander, Peter, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3309878